Honestly, I would get the dimensions of the tank to make sure it's 300 first. If it is, you'd be pretty silly not to buy it. I called about a 400g tank one time that was 72x18x22! Hahaha, the guy tried to defend himself by saying it had to be 400g because he couldn't even pick up one corner of the tank when it was full of water. I later explained to him how much 125 gallons of water weighed. After some arguing, he finally agreed to change his posting on craigslist